An aftershock of 5.0 on the Richter scale jolted southwest China's quake-hit area early Tuesday, according to the China Earthquake Networks Center.

The tremor hit Pingwu County (32.3 north latitude and 104.9 east longitude) of Sichuan Province at 1:52 AM., the center said.

An 8.0-magnitude earthquake struck Wenchuan County of Sichuan on May 12. More than 150 aftershocks measuring 4.0 magnitude or above have happened in the zone after the massive quake.

(Xinhua News Agency May 20, 2008)